package com.zlop.common.utils;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.stereotype.Component;

/**
 * SpringUtils
 * 
 * @author	曾令鹏
 * @since	1.0
 * @version 2018年5月8日 曾令鹏
 */
@Component
public final class SpringUtils implements BeanFactoryPostProcessor {
    
    /**
     * Spring应用上下文环境
     */
    @Autowired
    private static ConfigurableListableBeanFactory beanFactory;
    
    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory)
        throws BeansException {
        SpringUtils.beanFactory = configurableListableBeanFactory;
    }
    
    /**
     * 获取对象
     *
     * @param <T> the type parameter
     * @param name the name
     * @return Object 一个以所给名字注册的bean的实例
     * @throws BeansException the beans exception
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) throws BeansException {
        return (T) beanFactory.getBean(name);
    }
    
    /**
     * 获取类型为requiredType的对象
     *
     * @param <T> the type parameter
     * @param clz the clz
     * @return bean
     * @throws BeansException the beans exception
     */
    public static <T> T getBean(Class<T> clz) throws BeansException {
        T objResult = beanFactory.getBean(clz);
        return objResult;
    }
    
    /**
     * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
     *
     * @param name the name
     * @return boolean boolean
     */
    public static boolean containsBean(String name) {
        return beanFactory.containsBean(name);
    }
    
    /**
     * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
     *
     * @param name the name
     * @return boolean boolean
     * @throws NoSuchBeanDefinitionException the no such bean definition exception
     */
    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
        return beanFactory.isSingleton(name);
    }
    
    /**
     * 获取 type.
     *
     * @param name the name
     * @return Class 注册对象的类型
     * @throws NoSuchBeanDefinitionException the no such bean definition exception
     */
    public static Class<?> getType(String name) throws NoSuchBeanDefinitionException {
        return beanFactory.getType(name);
    }
    
    /**
     * 如果给定的bean名字在bean定义中有别名，则返回这些别名
     *
     * @param name the name
     * @return string [ ]
     * @throws NoSuchBeanDefinitionException the no such bean definition exception
     */
    public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
        return beanFactory.getAliases(name);
    }
    
}
